libstdc++-v3/testsuite/performance/27_io/fstream_seek_write.cc

   1 // Copyright (C) 2003 Free Software Foundation, Inc.
   2 //
   3 // This file is part of the GNU ISO C++ Library.  This library is free
   4 // software; you can redistribute it and/or modify it under the
   5 // terms of the GNU General Public License as published by the
   6 // Free Software Foundation; either version 2, or (at your option)
   7 // any later version.
   8
   9 // This library is distributed in the hope that it will be useful,
  10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 // GNU General Public License for more details.
  13
  14 // You should have received a copy of the GNU General Public License along
  15 // with this library; see the file COPYING.  If not, write to the Free
  16 // Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
  17 // USA.
  18
  19 // As a special exception, you may use this file as part of a free software
  20 // library without restriction.  Specifically, if other files instantiate
  21 // templates or use macros or inline functions from this file, or you compile
  22 // this file and link it with other files to produce an executable, this
  23 // file does not by itself cause the resulting executable to be covered by
  24 // the GNU General Public License.  This exception does not however
  25 // invalidate any other reasons why the executable file might be covered by
  26 // the GNU General Public License.
  27
  28 #include <fstream>
  29 #include <testsuite_performance.h>
  30
  31 // libstdc++/10672
  32 int main()
  33 {
  34   using namespace std;
  35   using namespace __gnu_test;
  36
  37   time_counter time;
  38   resource_counter resource;
  39   const int iterations = 300000;
  40
  41   fstream s("tmp_perf_seek", ios::binary | ios::in | ios::out | ios::trunc);
  42   if (s.good())
  43     {
  44       start_counters(time, resource);
  45       for (int i = 0; i < iterations; i++)
  46         {
  47           s.seekp(0);
  48           s.write((char *) & i, sizeof(int));
  49           s.seekp(sizeof(int));
  50           s.write((char *) & i, sizeof(int));
  51         }
  52       stop_counters(time, resource);
  53       report_performance(__FILE__, "", time, resource);
  54     }
  55
  56   unlink("tmp_perf_seek");
  57   return 0;
  58 }